You're feeling sentimental today. It could be your thoughts go back to a long lost ex when you hear a song on the radio. Or the news of your elementary school being demolished makes you cry. You shouldn't get disturbed by these eruptions of emotion. You're just working through some stuff and even if you're not consciously aware of what these issues are, you need to give yourself time to do it. Don't feel the need to make excuses or suppress what you feel.